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Stockholders' Equity/(Deficit) - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Mar. 21, 2017 shares | Oct. 01, 2016 Days $ / shares | Mar. 18, 2016 Days $ / shares | Feb. 09, 2016 | Jun. 09, 2015 USD ($) shares | Apr. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) shares | Dec. 31, 2016 USD ($) Directors $ / shares shares | Sep. 30, 2016 Directors | Jun. 30, 2016 Directors | Dec. 31, 2017 USD ($) Days Incentive_Plan $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split, conversion ratio |  |  |  | 0.50000 | 0.16666 |  |  |  |  |  | 0.08333 |  |
Common stock shares authorized |  |  |  |  |  |  |  | 75,000,000 |  |  | 75,000,000 | 75,000,000 |
Common stock, par value | $ / shares |  |  |  |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 | $ 0.0001 |
Preferred stock, par value | $ / shares |  |  |  |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 | $ 0.0001 |
Preferred stock, shares authorized |  |  |  |  |  |  |  | 24,984,166 |  |  | 24,984,166 | 24,984,166 |
Number of stock incentive plans | Incentive_Plan |  |  |  |  |  |  |  |  |  |  | 2 |  |
Stock incentive plan expiration date |  |  |  |  |  |  |  |  |  |  | Aug. 31, 2015 |  |
Compensation costs associated | $ |  |  |  |  |  |  |  |  |  |  | $ 833,985 | $ 1,778,461 | $ 2,348,744
Weighted average fair value of options granted | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Number of outside directors granted quarterly fees | Directors |  |  |  |  |  |  |  | 2 | 2 | 2 |  |  |
Weighted average estimated fair value of stock options | $ / shares |  |  |  |  |  |  |  | $ 1.75 |  |  | $ 0.00 | $ 1.75 | $ 8.52
Aggregate intrinsic values of options exercisable | $ |  |  |  |  |  |  |  | $ 16,633 |  |  | $ 0 | $ 16,633 | $ 0
Aggregate intrinsic values of options outstanding | $ |  |  |  |  |  |  |  | 16,633 |  |  | 0 | 16,633 | 0
Aggregate intrinsic values of options exercised | $ |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total fair value of shares vested | $ |  |  |  |  |  |  |  |  |  |  | 231,952 | 828,497 | 1,449,216
Total unrecognized compensation related to unvested share-based compensation awards | $ |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Award authorized by board |  |  |  |  | 450,000 |  |  |  |  |  |  |  |
Board Of Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  |  |  |  |  |  |  |  | 1-for-2 |  |
Series AA-2 Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  |  |  | 7,223,145 |  |
Series AA-2 Convertible Preferred Stock [Member] | Penelope Mining LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days | Days |  |  |  |  |  |  |  |  |  |  | 20 |  |
Series AA-1 Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  |  |  | 8,427,004 |  |
Preferred stock Liquidation preference accretion rate |  |  |  |  |  |  |  |  |  |  | 8.00% |  |
Epsilon Acquisitions, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest | $ |  |  |  |  |  |  |  |  |  |  | $ 299,294 | 259,372 |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares authorized |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |
Minimum [Member] | Series AA-2 Convertible Preferred Stock [Member] | Penelope Mining LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Closing price of common stock | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 15.12 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares authorized |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |
Notes Payable, Other Payables [Member] | Epsilon Acquisitions, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of Notes | $ / shares |  | $ 5.00 | $ 5.00 |  |  | $ 5.00 |  |  |  |  |  |  |
Conversion of stock, shares Issued | 670,455 |  |  |  |  | 670,455 | 670,455 |  |  |  | 670,455 |  |
Accrued interest | $ |  |  |  |  |  | $ 3,300,000 | $ 302,274 |  |  |  |  |  |
Number of trading days | Days |  | 75 | 75 |  |  |  |  |  |  |  |  |  |
Incentive Stock Options [Member] | 2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Award authorized by board |  |  |  |  | 450,000 |  |  |  |  |  |  |  |
Additional shares authorized for stock-based compensation |  |  |  |  |  |  |  |  |  |  | 200,000 |  |
Unvested Restricted Stock Awards Excluded from EPS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of restricted stock, awards vested | $ |  |  |  |  |  |  |  |  |  |  | $ 408,466 | 715,406 | 318,000
Fair value of unvested restricted stock awards | $ |  |  |  |  |  |  |  | $ 817,110 |  |  | $ 500,754 | $ 817,110 | $ 300,334
Weighted-average grant date fair value of restricted stock awards | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 3.54 |
Weighted-average remaining contractual term |  |  |  |  |  |  |  |  |  |  | 1 year | 2 years | 2 years 7 months 6 days
Total unrecognized compensation cost related to unvested restricted stock awards | $ |  |  |  |  |  |  |  |  |  |  | $ 484,614 |  |
Cuota Appreciation Rights [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation costs associated | $ |  |  |  |  |  |  |  |  |  |  | 0 |  |
Liability associated | $ |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Vested |  |  |  |  |  |  |  |  |  |  | 0 |  |
Excersisable |  |  |  |  |  |  |  |  |  |  | 0 |  |
Cuota Appreciation Rights [Member] | Carrying Value [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Value of cuotas of Oceanica | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 3.00 |  |
Cuota Appreciation Rights [Member] | Fair Value [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Value of cuotas of Oceanica | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 1.38 |  |
Cuota Appreciation Rights [Member] | Maximum [Member] | Key Employee Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Award authorized by board |  |  |  |  |  |  |  |  |  |  | 750,000 |  |
Cuota Appreciation Rights [Member] | Maximum [Member] | Director Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Award authorized by board |  |  |  |  |  |  |  |  |  |  | 600,000 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split, conversion ratio |  |  |  |  |  |  |  |  |  |  | 0.08333 |  |
Common Stock [Member] | Incentive Stock Options [Member] | 2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of incentive option granted |  |  |  |  |  |  |  |  |  |  | With respect to each grant of an ISO to a participant who is not a ten percent stockholder, the exercise price shall not be less than the fair market value of a share on the date the ISO is granted. With respect to each grant of an ISO to a participant who is a ten percent stockholder, the exercise price shall not be less than one hundred ten percent (110%) of the fair market value of a share on the date the ISO is granted. |  |
Maximum aggregate number of Shares with respect to one or more Awards that may be granted to any one person during any calendar year |  |  |  |  | 83,333 |  |  |  |  |  |  |  |
Maximum aggregate amount of cash that may be paid in cash to any person during any calendar year | $ |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |
Common Stock [Member] | Incentive Stock Options [Member] | Minimum [Member] | 2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Eligible employee threshold percentage |  |  |  |  |  |  |  |  |  |  | 10.00% |  |
Purchase price of common stock percentage |  |  |  |  |  |  |  |  |  |  | 110.00% |  |

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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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